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STOCKHOLDERS' EQUITY STOCKHOLDERS' EQUITY Part 2 AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Cumulative Translation Adjustment $ (248)   $ (248)   $ (284) $ (68)
Change in cumulative translation adjustment (70) $ 76 36 $ (136) (216)  
Benefit Plans Unrecognized Prior Service Credits 115   115   129 61
Amortization of unrecognized prior service credits included in net periodic costs (7) [1] (7) [1] (14) [1] (11) [1] 68  
Unrealized Gains (Losses) on Derivative Instruments (177)   (177)   (234) (269)
Change in Unrealized Gains (Losses) on Derivative Instruments 71 9 57 61 35  
Unrealized Losses on Investments (1)   (1)   (1) (1)
Change in Unrealized Losses on Investments     0   0  
Accumulated Other Comprehensive Income (Loss), Net of Tax (311)   (311)   (390) $ (277)
Total other comprehensive income (loss), net of tax $ (6) $ 78 $ 79 $ (86) $ (113)  
[1] Included in the calculation of net periodic benefit costs for pension and other postretirement benefit plans. See Note 9, "Retirement Plans".